Add cross reference functionality to Padre

Description

Add to Padre functionality of "find all references" to given subroutine/method/variable... Like in most C/Java IDEs (eclipse for example)... If possible - graph of callers / callee s will be great...
I assume - it is heavy dependent on another task of implementing project support - since such callers searches are usually performed in Project scope...
Another "great to have" feature - graph of classes hierarchy and ability to see graph of inheritance of given method...
I am not experienced enough in Perl internals - to raise such project my self... But - if some one of "Gurus" will lead it - I will gladly participate...